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Therefore, when calculating the value of each column of graphics the value of bit 7 (which is 64) must be added to the value of the print wires. The resulting value for column 1 is then 127 (63 plus the value of bit 7). 4-45 Column 2 contains no dots and therefore column 2 has a value of 64 (0 plus bit 7). This is also true for columns 3,4 and 5. In column 6 all six print wires are fired so column 6 has a value of 127 (63 plus bit 7). Columns 7,8,9,10 and 11 also have a value of 127. In column